Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b30737a520400b…

MALICIOUS

PDF

45.2 KB Created: 2020-08-06 20:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f2678d2e25dab77e5cd1c8e80d9f695 SHA-1: 526b4f6272df4fe85ee5f6a05e24f0c1b876e124 SHA-256: 31b30737a520400b24109f814d0592b83094060ec7301b6d1097fb3f15064d8c
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=back+stretches+handout+pdf', which is flagged as malicious. The presence of numerous external links, many pointing to Shopify domains, suggests a link farm or redirection strategy to obscure the final malicious destination.

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=back+stretches+handout+pdf
    • http://files.sharitavonsikphotography.com/uploads/1/3/2/3/132303378/d07ac2fcfd01.pdf
    • http://files.pmsmachinery.us/uploads/1/3/1/3/131382274/5d0d1e.pdf
    • http://files.fcdetail.com/uploads/1/3/1/3/131381067/27f7879d166.pdf
    • https://cdn.shopify.com/s/files/1/0428/2246/7740/files/36232353949.pdf
    • https://cdn.shopify.com/s/files/1/0430/1009/7313/files/gojotafisod.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/40359729460.pdf
    • https://cdn.shopify.com/s/files/1/0429/3040/5535/files/14445317478.pdf
    • https://cdn.shopify.com/s/files/1/0434/7065/1542/files/47085924688.pdf
    • https://cdn.shopify.com/s/files/1/0435/8130/9083/files/galaxozasebewu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/52522809833.pdf
    • https://cdn.shopify.com/s/files/1/0433/0219/1269/files/72074528345.pdf
    • https://cdn.shopify.com/s/files/1/0435/4965/5203/files/zagazikusozonoduvegumi.pdf
    • https://cdn.shopify.com/s/files/1/0436/4953/2069/files/vunerexarexurawutu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7785/1550/files/j_t_to_rf_t.pdf
    • https://cdn.shopify.com/s/files/1/0435/4146/3204/files/zidov.pdf
    • https://cdn.shopify.com/s/files/1/0433/9122/1911/files/angle_of_elevation_and_depression_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/9197/4557/files/42238358561.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000726d.bin
6efc7f3a75734bb34778e4d92d64f6331e07129845779386fd7c1af73ae415fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x726D 5324 bytes
font_01_sfnt_off00008486.bin
3256f2b58dbde39331e651751da8b46e54175010e10b63e5f097173762a5d876		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8486 10408 bytes

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